JP2020045782A - Vehicle control device - Google Patents

Abstract

To perform battery charging control according to a combustion state of an engine and a charging state of a battery when restarting the engine under idling stop control and thereby improving stall resistance and curbing a flat battery.SOLUTION: When restarting an engine under idling stop control, an ECU 8 performs power generation control of an alternator which charges a battery 5 on the basis of not only gradual energization control but also gradual voltage change control in a manner that: detects a deterioration state of the battery 5; adjusts a default value of target terminal voltage of the battery 5 in accordance with the deterioration state; and additionally increases or decreases the default value in accordance with the combustion state of the engine 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle control device having an idling stop control function for stopping an engine when a predetermined engine stop condition is satisfied and restarting the engine when a predetermined engine restart condition is satisfied.

  2. Description of the Related Art Conventionally, vehicles equipped with an engine as a driving source have been widely used to have an idling stop control function for improving fuel efficiency. An idling stop vehicle equipped with an idling stop control function includes a starter that starts an engine by turning on an IG (ignition) switch, an alternator that generates power by rotating the engine to charge a battery, and an IG switch after the engine starts. Idling stop control means for automatically stopping the engine when a predetermined engine stop condition is satisfied and automatically restarting the engine by a starter when a predetermined engine restart condition is satisfied until the engine is stopped by an off operation. The engine is repeatedly stopped and restarted by idling stop control during traveling until the IG switch is turned off to improve fuel efficiency.

  In this type of idling-stop vehicle, the generated current of the alternator is supplied to the battery while the vehicle is running, similar to a normal vehicle, and the battery is charged.However, in the idling stop control, the terminal voltage of the battery is restored when the engine is restarted. As shown in FIG. 8, in addition to the gradual excitation control for gradually increasing the current generated by the alternator from the initial value so that the terminal voltage of the battery coincides with the target voltage when the engine is restarted, It has been proposed to perform gradual change control for gradually increasing the voltage to a final value (see Patent Document 1). At this time, for example, the excitation control is performed so as to become 100% in 15 seconds, and the gradual change control is performed so as to increase by 0.01 V in 0.01 seconds.

  According to such a configuration, by the gradual excitation control, it is possible to suppress a sudden increase in the rotational resistance of the engine due to a sudden increase in the generator current, and in addition to the gradual excitation control, the target voltage gradually increases from the initial value to the final value. By performing the gradual change control such that the amount of discharge from the battery increases, the amount of discharge from the battery can be suppressed from increasing more than the amount of charge to the battery.

JP-A-2017-226275 (paragraphs 0036-0041 and the like)

  However, since the control in the configuration of Patent Document 1 is not a control in consideration of the combustion state of the engine, there is a possibility that the rotation stability (stall resistance) of the engine may be deteriorated depending on the combustion state of the engine. In addition, since the control is not performed in accordance with the state of charge of the battery, the battery may run down depending on the state of charge of the battery.

  SUMMARY OF THE INVENTION It is an object of the present invention to perform battery charge control according to the combustion state of the engine and the state of charge of the battery when the engine is restarted in the idling stop control, thereby improving stall resistance and suppressing battery running out.

  In order to achieve the above object, a vehicle control device according to the present invention includes a starter that starts an engine, an alternator that generates power by rotating the engine to charge a battery, and that when a predetermined engine stop condition is satisfied, the engine is started. An idling stop control means for performing an idling stop control for stopping the engine and restarting the engine by the starter when a predetermined engine restart condition is satisfied; and for restarting the engine, a terminal voltage of the battery is set to a target voltage. And a power generation control means for performing a gradual change control for gradually increasing the target voltage from an initial value to a final value, in addition to the gradual excitation control for gradually increasing the generated current by the alternator so as to coincide with Whether the combustion state of the engine is normal, slower than normal, or faster than normal Switching an initial value of the target voltage at the time of control by the power generation control means when the engine is restarted in accordance with the combustion state of the engine detected by the combustion state detection means; Setting means for setting, when the combustion state detecting means detects that the combustion state is slower than normal, the setting means sets the initial value of the target voltage to be lower than when the combustion state is normal. Setting the initial value of the target voltage to a higher value than when the combustion state is normal when the combustion state detection means detects that the combustion state is earlier than normal. Features.

  According to such a configuration, in the idling stop control, when the combustion state of the engine is slower than normal (or “long”) when the engine is restarted, the target thickness of the battery terminal voltage becomes higher than normal. If the combustion state of the engine is faster than usual (or "short"), the target voltage of the terminal voltage of the battery is set to be switched to the initial value higher than normal, and charging of the battery is started. Therefore, when the engine is restarted in the idling stop control, when performing the gradual change control in addition to the gradual excitation control in the power generation control of the alternator for charging the battery, by performing control according to the combustion state of the engine, Recovery of terminal voltage of the battery at the time of engine restart can be accelerated, and engine rotational stability (stall resistance It is possible to further improve.

  Further, a starter for starting the engine, an alternator for generating power by rotating the engine and charging a battery, and stopping the engine when predetermined engine stop conditions are satisfied, and when a predetermined engine restart condition is satisfied, An idling stop control unit for performing an idling stop control for restarting the engine by the starter, and when the engine is restarted, gradually increases a current generated by the alternator so that a terminal voltage of the battery matches a target voltage. A power generation control means for performing a gradual change control for gradually increasing the target voltage from an initial value to a final value, in addition to the gradual excitation control, wherein the battery detects a deterioration state based on a terminal voltage of the battery. Deterioration state detecting means, and the power generation control means when the engine is restarted. Setting means for switching and setting an initial value of the target voltage at the time of the control according to the battery deterioration state detected by the battery deterioration state detecting means, wherein the setting means includes a step of detecting the battery deterioration state. When the means detects that the minimum value of the terminal voltage of the battery is equal to or lower than a first determination threshold and is higher than a second determination threshold lower than the first determination threshold, the battery is in a first deteriorated state. The initial value of the target voltage is switched to a higher value than when a non-deterioration state in which the minimum value of the terminal voltage of the battery is higher than the first determination threshold is detected, and the battery deterioration state detection unit detects the minimum value of the terminal voltage of the battery. When it is detected that the value is in the second deterioration state equal to or less than the second determination threshold value, the initial value of the target voltage is higher than when the first deterioration state is detected. It may be set by switching to a higher value.

  According to such a configuration, in the idling stop control, when the engine is restarted, the minimum value of the terminal voltage of the battery is equal to or less than the first determination threshold and is smaller than the second determination threshold lower than the first determination threshold. If the first deterioration state is also high, the target voltage of the battery terminal voltage is set to be switched to an initial value higher than when the no-battery deterioration state is detected, and the minimum value of the battery terminal voltage is set to the second determination threshold. In the case of the following second deterioration state, the target voltage of the terminal voltage of the battery is set to be switched to a higher initial value than when the first deterioration state is detected, and the battery is charged. When restarting the engine, when performing gradual change control in addition to gradual excitation control in the power generation control of the alternator that charges the battery, By executing the control, on which can hasten the recovery of the battery terminal voltage when the engine is restarted, it is possible to suppress the battery exhaustion.

  Further, a starter for starting the engine, an alternator for generating power by rotating the engine and charging a battery, and stopping the engine when predetermined engine stop conditions are satisfied, and when a predetermined engine restart condition is satisfied, An idling stop control unit for performing an idling stop control for restarting the engine by the starter, and when the engine is restarted, gradually increases a current generated by the alternator so that a terminal voltage of the battery matches a target voltage. A power generation control means for performing a gradual change control for gradually increasing the target voltage from an initial value to a final value in addition to the gradual excitation control, wherein the battery detects a deterioration state based on a terminal voltage of the battery. The deterioration state detecting means, and whether the combustion state of the engine is normal or not. The battery state detecting means detects whether the engine is slower or earlier than normal, and the battery deterioration state detecting means detects the initial value of the target voltage at the time of control by the power generation control means when the engine is restarted. Setting means for switching and setting according to the deteriorated state of the battery, and the combustion state of the engine detected by the combustion state detecting means. When it is detected that the minimum value of the terminal voltage of the battery is equal to or less than the first determination threshold and is in the first deterioration state higher than the second determination threshold lower than the first determination threshold, the terminal voltage of the battery is determined. The initial value of the target voltage is switched to a higher value than when a non-deterioration state in which the minimum value is higher than the first determination threshold is detected, and the battery deterioration state detection procedure is performed. When the minimum value of the terminal voltage of the battery is detected to be in the second deterioration state that is equal to or less than the second determination threshold value, the initial value of the target voltage is further increased than when the first deterioration state is detected. In addition to switching to a higher value, when the combustion state detection means detects that the combustion state is slower than normal, the initial value of the switched target voltage is set to a lower value than when the combustion state is normal. When the combustion state detecting means detects that the combustion state is earlier than normal, the switched initial value of the target voltage may be set to be higher than when the combustion state is normal. .

  According to such a configuration, when performing the gradual change control in addition to the gradual excitation control in the power generation control of the alternator for charging the battery at the time of restarting the engine in the idling stop control, the control according to the battery deterioration state and the engine By performing control in accordance with the combustion state of the engine, the recovery of the terminal voltage of the battery when the engine is restarted can be accelerated, the battery can be suppressed from running out, and the rotational stability of the engine (stall resistance) can be improved. ) Can be further improved.

  According to the present invention, when the engine is restarted in the idling stop control, the charge control of the battery according to the combustion state of the engine and / or the deterioration state of the battery is performed, so that the stall resistance is improved and / or the battery is suppressed from running down. Can be achieved.

It is a block diagram of one embodiment of a vehicle control device of the present invention. FIG. 2 is an operation explanatory diagram of FIG. 1. FIG. 2 is an operation explanatory diagram of FIG. 1. FIG. 2 is an operation explanatory diagram of FIG. 1. FIG. 2 is an operation explanatory diagram of FIG. 1. It is a flowchart for operation | movement description of FIG. It is a flowchart for operation | movement description of FIG. It is operation | movement explanatory drawing of a conventional example.

  An embodiment of an idling stop vehicle equipped with the vehicle control device of the present invention will be described in detail with reference to FIGS.

  In FIG. 1, reference numeral 1 denotes a vehicle control device mounted on an idling stop vehicle driven by an engine 2, a starter 3 for starting the engine 2, an alternator 4 for generating electric power by rotation of the engine 2, and an alternator 4. And a battery 5 charged by the generated power. Here, the battery 5 is made of, for example, a lead battery having a nominal voltage of 12 V. The battery 5 is connected to an electric load 7 such as a wiper motor, a headlight, an air conditioner, and audio equipment mounted on an idling stop car. The electric load 7 is supplied from the battery 5 via the line 6.

  When the ignition (IG) switch is turned on to start the engine 2, a voltage is applied to the starter 3 from the battery 5 via the power supply line 6, the plunger of the starter 3 moves, and the starter gear of the starter 3 changes the starter gear of the engine 2. It meshes with the flywheel held on the crankshaft. Then, the relay provided on the starter 3 is turned on, the engine 2 is cranked, and the spark plug of the engine 2 is sparked while the engine 2 is cranked, so that the engine 2 is started.

  The alternator 4 includes a rotor, a stator, and an IC regulator. The rotor rotates with the rotation of the crankshaft of the engine 2, and a rotor coil provided on the rotor rotates. When the exciting current is supplied, a three-phase alternating current by electromagnetic induction flows through a stator coil provided on the stator. Then, the three-phase AC current is rectified into a DC voltage by a rectifier, DC power is output from the alternator 4 as generated power, and the generated power is supplied to the battery 5 via the power supply line 6 to charge the battery 5. You.

  At this time, the IC regulator of the alternator 4 controls the duty ratio of the exciting current supplied to the rotor coil. The power generation amount of the alternator 4 increases as the duty ratio of the field current increases, and conversely, decreases. The power generation amount of the alternator 4 decreases as the power consumption increases.

  The idling stop vehicle is provided with a plurality of ECUs (Electronic Control Units) having a microcomputer including a CPU, a memory, and the like, and each ECU performs two-way communication by CAN (Controller Area Network) communication. Has become. The plurality of ECUs include an ECU 8 shown in FIG. 1. The ECU 8 includes an accelerator pedal sensor that outputs a detection signal corresponding to an operation amount of an accelerator pedal, and a crankshaft of the engine 2. An engine speed sensor that outputs a pulse signal synchronized with rotation as a detection signal, a throttle opening sensor that outputs a detection signal corresponding to the opening of the electronic throttle valve (throttle opening) of the engine 2, and a terminal voltage of the battery 5. Various sensors such as a voltage sensor to be detected are connected. The ECU 5 is also supplied with power by the battery 5.

  The ECU 8 controls the electronic throttle valve, the injector, and the like of the engine 2 for starting, stopping, and adjusting the output of the engine 2 based on information obtained from detection signals of various sensors and various other information input from the ECU. And controls the ignition plug and the like. Further, the ECU 11 sets a target voltage which is a target value of the battery voltage, generates a voltage adjustment signal based on a difference between the target voltage and the battery voltage, and outputs the voltage adjustment signal to the IC regulator of the alternator 4; When the voltage adjustment signal is input to the IC regulator, the IC regulator controls the duty ratio of the exciting current of the alternator 4 based on the voltage adjustment signal.

  Also, the ECU 8 automatically stops the engine 2 when a predetermined engine stop condition is satisfied during traveling, and restarts the engine 2 by the starter 3 when a predetermined engine restart condition is satisfied during the automatic stop of the engine 2. It also has a stop control function. Such an idling stop control function of the ECU 8 corresponds to an idling stop control unit in the present invention. The control of the engine 2 and the idling stop control described above are not limited to the control by the ECU 8 alone, but may be controlled by a different ECU.

  By the way, the idling stop control operation of the idling stop car will be described. When the driver gets on and turns on an ignition (IG) switch (not shown) to instruct the engine start, a signal of the IG switch is input to the ECU 8. On the basis of this input, the relay of the starter 3 is momentarily energized and turned on by the ECU 8, the power is supplied from the battery 5 to the starter 3, the starter 3 is started, and the stopped engine 2 is started (first start). Once the engine 2 is started and the battery 52 is once charged to a fully charged state by the power generated by the alternator 4, thereafter, the idling stop control is executed by the ECU 8 until the engine 2 is stopped by turning off the IG switch. .

  When the ECU 8 during the idling stop control detects that the driver has depressed the brake pedal in accordance with, for example, a red signal of a traffic signal and the master cylinder pressure is equal to or higher than a predetermined depression pressure, the ECU 8 detects various sensors. When a predetermined stop condition of the idling stop control (for example, a condition in which a stop lamp is turned on and the vehicle speed is equal to or lower than a predetermined vehicle speed) is confirmed based on a signal from the vehicle, traveling does not stop completely. Also, at the timing when the vehicle speed falls below the predetermined vehicle speed, the fuel throttle to the engine 2 is throttled, and the engine 2 is automatically stopped.

  On the other hand, when it is detected by the ECU 8 that the driver releases his / her foot from the brake pedal due to a traffic light change to a green light and the master cylinder pressure drops to a predetermined release pressure, the ECU 8 causes the idling stop vehicle 1 to stop idling. When it is confirmed that a predetermined restart condition of the control (for example, a condition that the stop lamp is turned off and the door is closed) is satisfied, the relay of the starter 3 is momentarily energized based on a restart command from the ECU 8. The power is supplied to the starter 3 from the battery 5, the starter 3 is started, and the stopped engine 2 is automatically restarted. Thereafter, the automatic stop of the engine 2 based on the satisfaction of the predetermined stop condition during deceleration and the automatic restart of the engine 2 based on the satisfaction of the predetermined restart condition are alternately performed.

  When a voltage is applied to the starter 3 and the relay of the starter 3 is turned on to restart the engine 2 in the idling stop control, the current supplied from the battery 5 to the starter 3 increases, and the starter 3 A large torque is input to the engine 2 from the engine 2, and the engine 2 is cranked by the torque. When the current supplied to the starter 3 increases, the terminal voltage of the battery 5 drops rapidly as shown in FIG. . Therefore, the difference between the battery voltage and the target voltage increases due to the sudden drop of the battery voltage, and the duty ratio of the exciting current supplied to the field coil of the alternator 4 by the ECU 8 changes according to the difference between the battery terminal voltage and the target voltage. A voltage adjustment signal is generated so as to obtain a ratio, thereby increasing the exciting current suddenly, the rotational resistance of the crankshaft of the engine 2 increases rapidly, the rotational stability of the engine 2 is impaired, and the stall resistance is deteriorated. I do.

  Therefore, until the battery terminal voltage matches the target voltage, the ECU 8 generates a voltage adjustment signal based on the difference between the battery voltage and the target voltage so that the duty ratio of the exciting current increases at a predetermined change rate, Gradual excitation control is performed so that the generated current of the alternator 4 gradually increases from the initial value. In addition to such gradual excitation control, gradual change control is performed so that the target voltage gradually increases over time to a final value that is larger than the initial value. Such a power generation control function of the ECU 8 corresponds to a power generation control unit in the present invention.

  At this time, the deterioration state of the battery 5 is detected by the ECU 8 based on the terminal voltage of the battery 5 detected by the voltage sensor, and when the engine 2 is restarted by the ECU 8 according to the detected deterioration state of the battery 5. In addition to switching and setting the initial value of the target voltage during the gradual excitation control and the gradual change control, the combustion state of the engine 2 is detected based on the in-cylinder pressure in each cylinder during combustion of the engine 2, and The initial value of the pressure at the target set according to the deterioration state of the engine 5 is further switched and set according to the detected combustion state of the engine 2, and the gradual excitation control and the gradual change as described above are performed from the set initial value. Control is performed. The function of the switching setting by the ECU 8 corresponds to the setting means in the present invention.

  More specifically, the minimum value Vmin of the terminal voltage of the battery 5 when the engine 2 is restarted is equal to or less than the first determination threshold Vd1 and is lower than the first determination threshold Vd1 (second threshold Vd2 (<Vd1)). If the battery voltage is higher than the second determination threshold Vd2, it is determined that the battery 5 is in the second deteriorated state. Is detected. By the way, when the minimum value Vmin of the terminal voltage of the battery 5 is higher than the first determination threshold Vd1, it is detected that the battery 5 is in a state without deterioration. Such a function of detecting the deterioration state of the battery 5 by the ECU 8 corresponds to the battery deterioration state detecting means in the present invention.

  When the ECU 8 detects that the battery 5 is in a state without deterioration, the initial value of the target voltage of the terminal voltage of the battery 5 to be charged is set to, for example, 13.8 V shown in FIGS. When it is detected that the battery 5 is in the first deteriorated state, as shown in FIGS. 2 and 3, the initial value of the target voltage of the terminal voltage of the battery 5 is 14. The setting is switched to 1V. On the other hand, when it is detected that the battery 5 is in the second deteriorated state, as shown in FIGS. 2 and 4, the initial value of the target voltage of the terminal voltage of the battery 5 is higher than in the first deteriorated state. The value is switched to 14.3V.

  Further, the ECU 8 detects the combustion state of the engine 2 based on the in-cylinder pressure, as shown in FIG. 4, based on the in-cylinder pressure by a combustion pressure sensor that detects the combustion pressure in each cylinder of the engine 2. A good (normal) combustion state as the in-cylinder pressure, a fast combustion state in which the in-cylinder pressure becomes high within a shorter time than normal and a state where a so-called knocking phenomenon occurs, or longer than usual It is detected whether the combustion is in a slow (diffuse) combustion state in which the in-cylinder pressure becomes low over a time width. Such a function of detecting the combustion state of the engine 2 by the ECU 8 corresponds to the combustion state detection means in the present invention.

  When the ECU 8 detects that the combustion state of the engine 2 is in a good (normal) combustion state, the initial value of the target voltage switched according to the deterioration state of the battery 5 is switched back to high or low. When it is detected that the combustion state of the engine 2 is slower than usual, the initial value of the target voltage switched according to the deterioration state of the battery 5 is set to be switched lower by α than that. When it is detected that the combustion state of the engine 2 is earlier than usual, the initial value of the target voltage switched according to the deterioration state of the battery 5 is set to be switched higher by α than that.

  That is, when the initial value of the target voltage switched according to the deterioration state of the battery 5 is set to, for example, 13.8 V, which is the initial value in the state without deterioration, the combustion state of the engine 2 is good (normally). 5) is detected, for example, as shown in FIG. 5, 0 is selected as α to be added to or subtracted from the initial value, and the initial value of 13.8 V is set as it is. When it is detected that the combustion state of the engine 2 is slower than usual, -0.05 V is selected as α to be added to or subtracted from the initial value, and 13.75 V obtained by subtracting 0.05 V from 13.8 V is set. You. Further, when it is detected that the combustion state of the engine 2 is earlier than usual, +0.05 V is selected as α to be added to or subtracted from the initial value, and 13.85 V obtained by adding 0.05 V to 13.8 V is set. .

  At this time, α is learned each time the engine 2 is restarted, and the current value αn is set to a value obtained by adding or subtracting 0.05 V to the previous value αn-1. Thereby, the initial value of the target voltage according to the combustion state of the engine 2 at each time can be set.

  Α is preferably set in the range of −0.3 V as the lower limit and +0.3 V as the upper limit so that it does not become smaller than −0.3 V and does not become larger than +0.3 V.

  Next, the switching setting operation as setting means of the ECU 8 will be described with reference to the flowcharts of FIGS.

  As shown in FIG. 6, the minimum value Vmin of the terminal voltage of the battery 5 when the engine is restarted in the idle stop control is compared with predetermined first and second determination thresholds Vd1 and Vd2, and the battery 5 is in a state without deterioration. Is determined (step S1), and if this determination is YES, the initial value of the target voltage of the terminal voltage of the battery 5 is set to 13.8V (step S2).

  On the other hand, if the decision result in the step S1 is NO, a decision is made as to either the first deteriorated state or the second deteriorated state (step S3), and the minimum value Vmin of the terminal voltage of the battery 5 is equal to or less than the first decision threshold Vd1. When it is determined that the battery 5 is higher than the second determination threshold value Vd2 (<Vd1) and the battery 5 is in the first deteriorated state, the initial value of the target voltage of the terminal voltage of the battery 5 is set to 14.1 V (step S4). If the minimum value Vmin of the terminal voltage of the battery 5 is equal to or less than the second determination threshold value Vd2 and the battery 5 is determined to be in the second deteriorated state, the initial value of the target voltage of the terminal voltage of the battery 5 is set to the second deteriorated state. It is set to 14.3 V which is higher than that (step S5).

  Then, in the next step S &, the in-cylinder pressure obtained by the combustion pressure sensor is taken in (step S6), and it is determined whether or not the combustion state is fast (step S7). Αn to be added to or subtracted from the initial value is set to a value obtained by adding 0.05 V to the previous value αn−1 (step S8). On the other hand, if the decision result in the step S7 is NO, a decision is made as to whether or not the combustion state is slow (step S9). If the decision result is NO, the combustion state is good (normal). Is set to the same value as the previous value αn-1 (step S10), and if the result of the determination in step S9 is YES, the combustion state is slow. It is set to a value obtained by subtracting 0.05 V from the previous value αn-1 (step S11).

  Thereafter, as shown in FIG. 7, it is determined whether or not αn is equal to or higher than the lower limit value of −0.3 V and equal to or lower than the upper limit value of +0.3 V (step S12). Is NO, it is determined whether αn is larger than +0.3 V or smaller than −0.3 V (step S 13). If αn is larger than +0.3 V, the value exceeds the upper limit. αn is set to the upper limit of +0.3 V (step S14). If αn is smaller than −0.3 V, it is below the lower limit, and αn is set to the lower limit of −0.3 V (step S15). ).

  Then, the determination result in step S12 is YES, that is, when αn is equal to or more than −0.3 V and equal to or less than +0.3 V, and after the processing in steps S14 and S15, the process proceeds to step S16, and steps S2 and S4 , S5 are added to the initial value set in the processing of steps S12 to S15 to set the initial value to be switched (step S16). The battery 5 is charged by the control and the gradual change control.

  Therefore, according to the present embodiment, when performing the gradual change control in addition to the gradual excitation control in the power generation control of the alternator 4 for charging the battery 5 at the time of restarting the engine in the idling stop control, according to the charging state of the battery 5 Executing the control according to the combustion state of the engine 2 and the control of the engine 2 makes it possible to speed up the recovery of the terminal voltage of the battery 5 when the engine is restarted, and to suppress the battery running down. The rotation stability (stall resistance) of the engine 2 can be further improved.

  Further, a value obtained by adding or subtracting 0.05 V to the previous value αn−1 as the current value αn learned each time the engine 2 is restarted is added to the initial value switched and set according to the deterioration state of the battery 5. With this setting, the initial value of the target voltage according to the combustion state of the engine 2 at each time can be set.

  The present invention is not limited to the above-described embodiment, and various changes other than those described above can be made without departing from the gist of the present invention.

  For example, in the above-described embodiment, the case where the combustion state of the engine 2 is determined based on the in-cylinder pressure of the cylinder detected by the combustion pressure sensor has been described. However, the waveform according to the combustion state of the air-fuel mixture in each cylinder is described. May be detected by an ion current measuring circuit provided in the spark plug, and may be detected based on the detected ion current waveform.

  Further, in the above-described embodiment, when the engine is restarted in the idling stop control, when the gradual change control is performed in addition to the gradual excitation control in the power generation control of the alternator 4 for charging the battery 5, depending on the deterioration state of the battery 5, Although the example in which the control according to the combustion state of the engine 2 and the control according to the combustion state of the engine 2 are performed has been described, only the control according to the combustion state of the engine 2 or the control according to the deterioration state of the battery 5 may be performed. Good.

  Further, in the above-described embodiment, the description has been given of the case where the deterioration state of the battery 5 has two stages of the first and second deterioration states. However, the deterioration state of three or more stages is detected and the initial value is switched and set. You may. Further, in the combustion state of the engine 2, in addition to the normal (good) state, two stages of early or late are detected, but three or more stages may be detected.

  The present invention can be applied to a vehicle control device for a vehicle having a function of performing gradual change control in addition to gradual excitation control in power generation control of the alternator 4 that charges the battery 5 when the engine is restarted in idling stop control. it can.

DESCRIPTION OF SYMBOLS 1 Vehicle control apparatus 2 Engine 3 ... Starter 4 ... Alternator 5 ... Battery 8 ... ECU (Idling stop control means, power generation control means, combustion state detection means, battery deterioration state detection means, setting means)

Claims (3)

A starter for starting the engine, an alternator for generating a power by rotating the engine and charging a battery, stopping the engine when predetermined engine stop conditions are satisfied, and starting the starter when predetermined engine restart conditions are satisfied. An idling stop control means for performing an idling stop control for restarting the engine, and a gradual excitation for gradually increasing a current generated by the alternator so that a terminal voltage of the battery becomes equal to a target voltage when the engine is restarted. In addition to the control, the vehicle control device comprising:
Whether the combustion state of the engine is normal, slower than normal, or combustion state detection means for detecting whether it is earlier than normal,
Setting means for switching and setting the initial value of the target voltage at the time of control by the power generation control means at the time of restarting the engine in accordance with the combustion state of the engine detected by the combustion state detection means,
The setting means,
When the combustion state is detected by the combustion state detection means as being slower than normal, the initial value of the target voltage is switched to a value lower than when the combustion state is normal, and set.
A vehicle control device for switching the initial value of the target voltage to a higher value than when the combustion state is normal when the combustion state detection means detects that the combustion state is earlier than normal. . A starter for starting the engine, an alternator for generating a power by rotating the engine and charging a battery, stopping the engine when predetermined engine stop conditions are satisfied, and starting the starter when predetermined engine restart conditions are satisfied. An idling stop control means for performing an idling stop control for restarting the engine, and a gradual excitation for gradually increasing a current generated by the alternator so that a terminal voltage of the battery becomes equal to a target voltage when the engine is restarted. In addition to the control, the vehicle control device comprising:
Battery deterioration state detection means for detecting a deterioration state based on the terminal voltage of the battery,
Setting means for switching and setting an initial value of the target voltage at the time of control by the power generation control means at the time of restarting the engine in accordance with the deterioration state of the battery detected by the battery deterioration state detection means. ,
The setting means,
The battery deterioration state detection means detects that the battery is in a first deterioration state in which the minimum value of the terminal voltage of the battery is equal to or less than a first determination threshold and higher than a second determination threshold lower than the first determination threshold. The initial value of the target voltage is switched to a higher value than when a no-deterioration state in which the minimum value of the battery terminal voltage is higher than a first determination threshold is detected,
When the battery deterioration state detecting means detects that the minimum value of the terminal voltage of the battery is the second deterioration state which is equal to or less than the second determination threshold value, the target deterioration state is longer than when the first deterioration state is detected. A vehicle control device, wherein an initial value of a voltage is switched to a higher value and set. A starter for starting the engine, an alternator for generating a power by rotating the engine and charging a battery, stopping the engine when predetermined engine stop conditions are satisfied, and starting the starter when predetermined engine restart conditions are satisfied. An idling stop control means for performing an idling stop control for restarting the engine, and a gradual excitation for gradually increasing a current generated by the alternator so that a terminal voltage of the battery becomes equal to a target voltage when the engine is restarted. In addition to the control, the vehicle control device comprising:
Battery deterioration state detection means for detecting a deterioration state based on the terminal voltage of the battery,
Whether the combustion state of the engine is normal, slower than normal, or combustion state detection means for detecting whether it is earlier than normal,
The initial value of the target voltage at the time of control by the power generation control means at the time of restarting the engine is detected by the battery deterioration state detected by the battery deterioration state detection means, and detected by the combustion state detection means. Setting means for switching and setting according to the combustion state of the engine.
The setting means,
The battery deterioration state detection means detects that the battery is in a first deterioration state in which the minimum value of the terminal voltage of the battery is equal to or less than a first determination threshold and higher than a second determination threshold lower than the first determination threshold. The initial value of the target voltage is switched to a higher value than when a no-deterioration state in which the minimum value of the battery terminal voltage is higher than a first determination threshold is detected,
When the battery deterioration state detecting means detects that the minimum value of the terminal voltage of the battery is the second deterioration state which is equal to or less than the second determination threshold value, the target deterioration state is more than when the first deterioration state is detected. In addition to switching the initial value of the voltage to a higher value,
When the combustion state is detected by the combustion state detection means as being slower than normal, the switched initial value of the target voltage is set to be lower than when the combustion state is normal, and
A vehicle control method, wherein when the combustion state detection means detects that the combustion state is earlier than normal, the switched initial value of the target voltage is set to be higher than when the combustion state is normal. apparatus.

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